Figure 1: THz conductivity measurement scheme and sample characterizations. | Nature Communications

Figure 1: THz conductivity measurement scheme and sample characterizations.

From: Ultrafast terahertz snapshots of excitonic Rydberg states and electronic coherence in an organometal halide perovskite

Figure 1

(a) Schematics of exciton dispersion near K≈0, with internal quantum transitions of 1s→2p and 1s→3p marked. Photoexcitation creates pair transitions in the perovskites that are resonantly probed by THz pulses. (b,c) SEM images of pure CH3NH3PbI3 powder and CH3NH3PbI3/PMMA film, respectively. (d) X-ray diffraction measurement of perovskite film and powder. (e) Absorption spectra of the perovskite/PMMA film at various temperatures. Shown together are the two pump spectra (#1 and #2, shade).

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